Lip brush
The advantage that lip brushes with labial depends on meticulous, for instance can draw the outline of the shape of labial horn very fine, can make labial form more complete.
A lip brush is a great prop when you need to use two different shades of lipstick to create the desired color. Another function is to adjust the shape of the lips. Different face shapes have different lip shapes.
A good lip shape can visually change the shape of your face, especially your chin and cheek.